Ruby Standard Library¶ ↑

The Ruby Standard Library is a vast collection of classes and modules that you can require in your code for additional features.

Below is an overview of libraries and extensions followed by a brief description.

Libraries¶ ↑

Abbrev: Calculates a set of unique abbreviations for a given set of strings
Base64: Support for encoding and decoding binary data using a Base64 representation
Benchmark: Provides methods to measure and report the time used to execute code
CGI: Support for the Common Gateway Interface protocol
CMath: Provides Trigonometric and Transcendental functions for complex numbers
complex.rb: Deprecated library replaced by C implementation in core
ConditionVariable: Augments the Mutex class, provided by thread.rb
CSV: Provides an interface to read and write CSV files and data
DEBUGGER__: Debugging functionality for Ruby
Delegator: Provides three abilities to delegate method calls to an object
DRb: Distributed object system for Ruby
E2MM: Module for defining custom exceptions with specific messages
English.rb: Require 'English.rb' to reference global variables with less cryptic names
ERB: An easy to use but powerful templating system for Ruby
FileUtils: Several file utility methods for copying, moving, removing, etc
Find: This module supports top-down traversal of a set of file paths
Forwardable: Provides delegation of specified methods to a designated object
GetoptLong: Parse command line options similar to the GNU C getopt_long()
GServer: HTTP server with logging, thread pooling and multi-server management
IPAddr: Provides methods to manipulate IPv4 and IPv6 IP addresses
IRB: Interactive Ruby command-line tool for REPL (Read Eval Print Loop)
Logger: Provides a simple logging utility for outputing messages
mathn.rb: Deprecated library that extends math operations
MakeMakefile: Module used to generate a Makefile for C extensions
Matrix: Represents a mathematical matrix.
MiniTest: A test suite with TDD, BDD, mocking and benchmarking
Monitor: Provides an object or module to use safely by more than one thread
Mutex_m: Mixin to extend objects to be handled like a Mutex
Net::FTP: Support for the File Transfer Protocol
Net::HTTP: HTTP client api for Ruby
Net::IMAP: Ruby client api for Internet Message Access Protocol
Net::POP3: Ruby client library for POP3
Net::SMTP: Simple Mail Transfer Protocol client library for Ruby
Net::Telnet: Telnet client library for Ruby
Observable: Provides a mechanism for publich/subscribe pattern in Ruby
OpenURI: An easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP
Open3: Provides access to stdin, stdout and stderr when running other programs
OptionParser: Ruby-oriented class for command-line option analysis
OpenStruct: Class to build custom data structures, similar to a Hash
PP: Provides a PrettyPrinter for Ruby objects
PrettyPrinter: Implements a pretty printing algorithm for readable structure
Prime: Prime numbers and factorization library
profile.rb: Runs the Ruby Profiler__
Profiler__: Provides a way to profile your Ruby application
PStore: Implements a file based persistence mechanism based on a Hash
Queue: Synchronized communication between threads, provided by thread.rb
Racc: A LALR(1) parser generator written in Ruby.
Rake: Ruby build program with capabilities similar to make
rational.rb: Deprecated library replaced by C implementation in core
RbConfig: Information of your configure and build of Ruby
RDoc: Produces HTML and command-line documentation for Ruby
resolv-replace.rb: Replace Socket DNS with Resolv
Resolv: Thread-aware DNS resolver library in Ruby
REXML: An XML toolkit for Ruby
Rinda: The Linda distributed computing paradigm in Ruby
RSS: Family of libraries that support various formats of XML “feeds”
Gem: Package management framework for Ruby
Scanf: A Ruby implementation of the C function scanf(3)
SecureRandom: Interface for secure random number generator
Set: Provides a class to deal with collections of unordered, unique values
Shell: An idiomatic Ruby interface for common UNIX shell commands
Shellwords: Manipulates strings with word parsing rules of UNIX Bourne shell
Singleton: Implementation of the Singleton pattern for Ruby
Synchronizer: A module that provides a two-phase lock with a counter
Tempfile: A utility class for managing temporary files
Test::Unit: A compatibility layer for MiniTest
Thread: Provides support classes for threaded programs
ThreadsWait: Watches for termination of multiple threads
Time: Extends the Time class with methods for parsing and conversion
Timeout: Auto-terminate potentially long-running operations in Ruby
tmpdir.rb: Extends the Dir class to manage the OS temporary file path
Tracer: Outputs a source level execution trace of a Ruby program
TSort: Topological sorting using Tarjan's algorithm
un.rb: Utilities to replace common UNIX commands
URI: A Ruby module providing support for Uniform Resource Identifiers
WeakRef: Allows a referenced object to be garbage-collected
WEBrick: An HTTP server toolkit for Ruby
XMLRPC: Remote Procedure Call over HTTP support for Ruby
YAML: Ruby client library for the Psych YAML implementation

Extensions¶ ↑

BigDecimal: Provides arbitrary-precision floating point decimal arithmetic
Coverage: Provides coverage measurement for Ruby
Date: A subclass of Object includes Comparable module for handling dates
DateTime: Subclass of Date to handling dates, hours, minutes, seconds, offsets
DBM: Provides a wrapper for the UNIX-style Database Manager Library
Digest: Provides a framework for message digest libraries
DL: Provides a wrapper for the UNIX dlopen() library
Etc: Provides access to information typically stored in UNIX /etc directory
Fcntl: Loads constants defined in the OS fcntl.h C header file
Fiddle: A libffi wrapper for Ruby
GDBM: Ruby extension for the GNU dbm (gdbm) library
IO: Extensions for Ruby IO class, including wait and ::console
JSON: Implements Javascript Object Notation for Ruby
NKF: Ruby extension for Network Kanji Filter
objspace: Extends ObjectSpace module to add methods for internal statistics
OpenSSL: Provides SSL, TSL and general purpose cryptography for Ruby
Pathname: Representation of the name of a file or directory on the filesystem
Psych: A YAML parser and emitter for Ruby
PTY: Creates and manages pseudo terminals
Readline: Provides an interface for GNU Readline and Edit Line (libedit)
Ripper: Provides an interface for parsing Ruby programs into S-expressions
SBDM: Provides a simple file-based key-value store with String keys and values
Socket: Access underlying OS socket implementations
StringIO: Pseudo I/O on String objects
StringScanner: Provides lexical scanning operations on a String
Syslog: Ruby interface for the POSIX system logging facility
Tk: Provides a framework for building a Graphical User Interface (GUI)
WIN32OLE: Provides an interface for OLE Automation in Ruby
Zlib: Ruby interface for the zlib compression/decompression library